Add Salt 2018.3 tests

Change-Id: I3e525871c553f1477223b7aaf7f1d357176b1917
diff --git a/.travis.yml b/.travis.yml
index 4898a3f..ea20576 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -17,18 +17,26 @@
   - bundle install
 
 env:
-  - PLATFORM=epcim/salt-formulas:saltstack-ubuntu-xenial-salt-2016.3 SUITE=client
-  - PLATFORM=epcim/salt-formulas:saltstack-ubuntu-xenial-salt-2016.3 SUITE=server
-  - PLATFORM=epcim/salt-formulas:saltstack-ubuntu-xenial-salt-2017.7 SUITE=client
-  - PLATFORM=epcim/salt-formulas:saltstack-ubuntu-xenial-salt-2017.7 SUITE=server
-#
-  - PLATFORM=epcim/salt-formulas:saltstack-ubuntu-xenial-salt-2016.3 SUITE=client_auth
-  - PLATFORM=epcim/salt-formulas:saltstack-ubuntu-xenial-salt-2016.3 SUITE=server_auth
-  - PLATFORM=epcim/salt-formulas:saltstack-ubuntu-xenial-salt-2017.7 SUITE=client_auth
-  - PLATFORM=epcim/salt-formulas:saltstack-ubuntu-xenial-salt-2017.7 SUITE=server_auth
-
-  # - PLATFORM=epcim/salt-formulas:saltstack-ubuntu-bionic-salt-2017.7 SUITE=client
-  # - PLATFORM=epcim/salt-formulas:saltstack-ubuntu-bionic-salt-2017.7 SUITE=server
+  - PLATFORM=epcim/salt:saltstack-ubuntu-xenial-salt-2016.3 SUITE=client
+  - PLATFORM=epcim/salt:saltstack-ubuntu-xenial-salt-2016.3 SUITE=client-auth
+  - PLATFORM=epcim/salt:saltstack-ubuntu-xenial-salt-2016.3 SUITE=server
+  - PLATFORM=epcim/salt:saltstack-ubuntu-xenial-salt-2016.3 SUITE=server-auth
+  - PLATFORM=epcim/salt:saltstack-ubuntu-xenial-salt-2017.7 SUITE=client
+  - PLATFORM=epcim/salt:saltstack-ubuntu-xenial-salt-2017.7 SUITE=client-auth
+  - PLATFORM=epcim/salt:saltstack-ubuntu-xenial-salt-2017.7 SUITE=server
+  - PLATFORM=epcim/salt:saltstack-ubuntu-xenial-salt-2017.7 SUITE=server-auth
+  - PLATFORM=epcim/salt:saltstack-ubuntu-xenial-salt-2018.3 SUITE=client
+  - PLATFORM=epcim/salt:saltstack-ubuntu-xenial-salt-2018.3 SUITE=client-auth
+  - PLATFORM=epcim/salt:saltstack-ubuntu-xenial-salt-2018.3 SUITE=server
+  - PLATFORM=epcim/salt:saltstack-ubuntu-xenial-salt-2018.3 SUITE=server-auth
+  # - PLATFORM=epcim/salt:saltstack-ubuntu-bionic-salt-2017.7 SUITE=client
+  # - PLATFORM=epcim/salt:saltstack-ubuntu-bionic-salt-2017.7 SUITE=client-auth
+  # - PLATFORM=epcim/salt:saltstack-ubuntu-bionic-salt-2017.7 SUITE=server
+  # - PLATFORM=epcim/salt:saltstack-ubuntu-bionic-salt-2017.7 SUITE=server-auth
+  # - PLATFORM=epcim/salt:saltstack-ubuntu-bionic-salt-2018.3 SUITE=client
+  # - PLATFORM=epcim/salt:saltstack-ubuntu-bionic-salt-2018.3 SUITE=client-auth
+  # - PLATFORM=epcim/salt:saltstack-ubuntu-bionic-salt-2018.3 SUITE=server
+  # - PLATFORM=epcim/salt:saltstack-ubuntu-bionic-salt-2018.3 SUITE=server-auth
 
 before_script:
   - set -o pipefail